Water Piping - Weil-McLain GOLD CGt Manual

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4a
Water piping — general information
General piping information
If installation is to comply with ASME or Canadian requirements, an additional
is needed. Install control in supply piping between
high temperature limit
boiler and isolation valve. Set second control to minimum 20 °F above setpoint
of first control. Maximum allowable setpoint is 240 °F. See section
35, for wiring.
A is required when boiler is installed above radiation
low water cutoff device
level or by certain state or local codes or insurance companies. Use low water
cutoff designed for water installations. Electrode probe-type is recommended.
Purchase and install in tee in supply piping above boiler.
Use in cold water supply as required by local codes.
backflow check valve
If boiler is installed in a closet, it is recommended to insulate the boiler piping
in closet to lower closet air temperature.
Pressure/temperature gauge
Install pressure/temperature gauge in tee on supply piping (as shown in
drawing on page 3). The gauge well is a self-closing valve, allowing removal
of the gauge without draining the system.
Slowly remove pressure/temperature gauge from well.
The self-closing valve could leak if clogged with
sediment. If water begins to spray, stop removing gauge.
Close system fill valve and drain enough water to release
system pressure before continuing with gauge removal.
Escaping hot water could cause severe personal injury.
Relief valve
Install relief valve vertically in ¾" tapping on side of boiler. See
and the tag attached to the relief valve for manufacturer's instructions.
To avoid water damage or scalding due to relief valve
operation:
• Discharge line must be connected to relief valve outlet and
. Terminate the discharge line to eliminate possibility
place of disposal
of severe burns should the valve discharge.
• Discharge line must be as short as possible and be the
valve discharge connection
• Discharge line must
pitch downward
least 6" above the floor drain where any discharge will be clearly visible.
• The discharge line shall
terminate plain, not threaded,
serviceable for temperatures of 375 °F or greater.
•
Do not pipe the discharge to any place where freezing could occur.
• shall be installed between the relief valve and boiler, or
No shutoff valve
in the discharge line. Do not plug or place any obstruction in the
discharge line.
• with the above guidelines could result in failure of
Failure to comply
the relief valve to operate, resulting in possibility of severe personal
injury, death or substantial property damage.
•
Test the operation of the valve
lifting the lever. Make sure the valve discharges freely. If the valve fails to
operate correctly, replace it with a new relief valve.
20
Figure 16 or 17
run to a safe
same size as the
throughout its entire length.
from the valve and terminate at
with a material
after filling and pressurizing system by
Circulator and 3-way valve
1. See page 60,
Figure 39
2. Apply pipe dope to fittings and install in boiler supply
and return tappings in the order shown in Figure 39.
3. Install circulator, flanges and gaskets.
, page
9b
4. Complete by soldering copper fittings and 3-way valve
in the order shown in Figure 39.
5. Pull 3-way valve Molex and harness through jacket
top left conduit opening.
6. Insert Molex connector into mating connector on 3-
way valve. Make sure that valve body is in correct
position as shown in Figure 39 on page 60.
The circulator is shipped loose (wiring pre-attached to
boiler). Pipe the circulator on the return line only, as
shown on page 3 and page 60. Pipe the expansion tank to
the suction side of the circulator as shown in Figures 16
and 17. Install an air separator in the supply piping.
Always install the system fill connection at the same point
as the expansion tank connection to the system.
and show typical near-boiler piping connections.
16 17
System water piping
See (diaphragm-type or bladder-type
Figure 16
expansion tank) or
tank) on page 21, and
and single-zone systems designed for return water at
least 130 °F.
See pages 22-23 to complete multiple-zone piping or
pages 24-25 to complete piping for radiant heating
systems or converted gravity systems.
Refer to page 27 for boilers used with refrigeration systems.
Table 5 Water pipe size (based on 20 °F rise)
Boiler
model number
CGt
Note: Circulator flange supplied with boiler is same size as
recommended piping above.
• Chilled medium, if used, is piped in parallel with
heating boiler. Use appropriate valves to prevent
chilled medium from entering boiler. Consult
I=B=R Installation and Piping Guides.
• If boiler is connected to heating coils located in air
handling units where they can be exposed to
refrigerated air, use flow control valves or other
automatic means to prevent gravity circulation
during cooling cycle. Circulation of cold water
through the boiler could result in damage to the
heat exchanger, causing possible severe personal
injury, death or substantial property damage.
.
Figures
(closed-type expansion
Figure 17
below, for near-boiler
Table 5
To From
system system
1" 1"
Install boiler such that —
Part Number 550-110-290/0501